Abstract: A portable telephone may include an AV processing block (200), a telephone processing block (300) and a common processing block (400). A power management controller (101) may control a power supply of each block, i.e. operation and non-operation. The power management controller (101) may have connected thereto a power supply key (K1) and a power supply decision key (K2). When depressing the key (K1) sequentially, the user can repeatedly select an AV mode, a PHONE mode and an AV/PHONE mode. A user can determine the selected mode by depressing the key (K2). In the area in which a use of an electronic device which may generate electromagnetic waves is prohibited, a user can use this portable telephone in the AV mode. Also, outside the telephone service area, a user can use this portable telephone in the AV mode, thereby making it possible to avoid electric power from being uselessly consumed when the power supply of the telephone processing block (300) is held at ON state.

Abstract: An electronic device may include a plurality of function sections which can function independently. A CPU can control the functions of the respective function sections by controlling a power from the battery pack. A user may select a desired reserved function section and input an available time of the desired reserved function section by operating a key matrix, thereby executing the setting such that one or a plurality of function sections thus reserved can be used during a predetermined time period.

Abstract: A system for testing an overall system employing an integrated circuit with a modulator thereon is disclosed. The system for testing includes structure for causing the modulator to continually transmit data and structure for causing the continually transmitted data to exhibit extreme frequency deviation. In both instances the structure may be a single register. This register may also include a set of bits that may be set to select a continuous or an alternating pattern or, stated another way, a maximum or a minimum peak frequency deviation.

Abstract: A communication method and a communication apparatus, in which a terminal can be selected in accordance with a specific application, and the abuse thereof can be prevented in the case of terminal being stolen or lost. When a terminal is connected to a predetermined communication network by using an identification code assigned to each terminal, a specific identification code assigned to a first terminal can be set to a predetermined second terminal by a predetermined operation. The first terminal can not use the above-mentioned specific identification code which is set in the second terminal.

Abstract: A mobile communication subscriber apparatus such as a portable phone allows its user to make prompt contact with someone who places a call to a specific phone served as a local base station to the subscriber apparatus. The mobile communication subscriber apparatus is arranged to register its position to a base station when it is used at an external mode. This subscriber apparatus provides a mechanism for transmitting a control signal for indicating change of the settings of an answering function of the local base station.

Abstract: A method for facilitating communication between parent telephones and child telephones in a cordless telephone system. The method includes steps of dividing a plurality of channels into groups and assigning each parent telephone to one of the groups. When a child telephone is registered with one of the parent telephones, the child telephone may scan only the channels in the group assigned to the parent telephone with which the child telephone is registered, rather than the entire plurality of channels in the cordless telephone system.

Abstract: A noise reduction circuit (13) in which a difference signal (S.sub.I -S.sub.I1) between the original video signal (S.sub.I) and a delayed video signal (S.sub.I1) obtained by passing the original video signal (S.sub.I) through a delay circuit (5) is obtained, and a signal obtained by passing the above difference signal (S.sub.I -S.sub.I1) through a gain control amplifier (8) is subtracted from the above original video signal (S.sub.I), and the gain which reflects movement in the gain control amplifier (8) is controlled by a movement detection signal (S.sub.M) of the above original video signal (S.sub.z) and a detection signal (S.sub.c) which reflects the input electric field strength so as not to decrease the gain of the gain control amplifier (8) at middle to weak electric field, the noise reduction circuit may be applied to a television receiver, etc.

Abstract: A noise reduction circuit in which a video signal (S.sub.I) is divided into a first signal (S.sub.L) having low frequency component and a second signal (S.sub.H1) having high frequency component, the above second signal (S.sub.H1) is divided into a third signal (S.sub.H2) having an amplitude more than a predetermined value and a fourth signal (S.sub.H3) having an amplitute less than the predetermined value, a noise reduction process using a delay circuit (12) is applied to the above fourth signal (S.sub.H3) to obtain a fifth signal (S.sub.H4), and the above first signal (S.sub.L), third signal (S.sub.H2) and fifth signal (S.sub.H4) are added, the noise reduction circuit being applicable to apply to a television receiver, etc.